Overdrive Trans - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sb69chevy · 04-06-2007, 03:49 PM

Found a 67 truck in the yard today that had an overdrive transmission listed on its SPID. Tranny was gone, but there was a cable below the dash w/ "overdrive" placard around it. Never seen this before, just thought I would share. May not be any big deal. This truck also had an option that read something like "GM Air Inj Reactor"...What is this?

I'll go back and get pics next week, if wanted.

gmc1969custom · 04-06-2007, 03:55 PM

Sounds interesting.

JHART · 04-06-2007, 04:25 PM

i'd like to see some pics .... sound wierd to me would like to see more.

sb69chevy · 04-06-2007, 04:36 PM

Yeah, it through me for a loop, too. I was in a hurry to get to work or I would've gone back to get the camera. I'm glad the glove box was still in the cab floor. Is there a "rare" or hard to find steering wheel cap for these (67-68)?

JHART · 04-06-2007, 04:38 PM

I dont know about "rare" but i do know lmctruck.com has some.

I never heard of a 67 with overdrive trans.... would be really cool find if it was though.

1969k10stepside · 04-06-2007, 04:39 PM

Quote:

Originally Posted by sb69chevy

Is there a "rare" or hard to find steering wheel cap for these (67-68)?

There is a glass one that some people want

sb69chevy · 04-06-2007, 04:39 PM

I don't need one, just saw one in the floor of the same truck. Looked very nice. Were there 2 different styles maybe?

Longhorn Man · 04-06-2007, 04:39 PM

the overdrive was a very weak tranny offered on the smaller engines. If I recall, it wasn't even strong enough to hold up to the little 327. They worked fine, and there's stillsome on the road today. They also came in cars of the late 60's too.
The air injection thing was very common in the late 70's up to the mid 90s or so... a smog pump would shoot air in the exhaust to help with emissions.
that horn button is a valuable piece if in good shape. A 67 only item, it was part of the CST package.

sb69chevy · 04-06-2007, 04:43 PM

Okay, so not that big of a deal on the OD thing...The horn cap did have glass or hard plastic in the center of if it. Looked pretty good.

ThatOneBlue67 · 04-06-2007, 05:32 PM

Could someone find a pic of that cap? I'd love to see what it looks like!

Bus Ted Knuckle · 04-06-2007, 06:04 PM

The overdrives were pretty common in the late 50's and 60's especially in cars, but also found in trucks till they found out they coudn't stand up to normal truck use.

My Dad used to drive a 72 SWB w/ a 250 and a manual three speed column shift. He put an overdrive trans in it to lower the RPM's on the freeway. You could pull the cable under the dash to lock the trans from going into overdrive (like for towing). You shift through the three gears as usual, and when you were cruising along in third, you let up on the gas pedal and the trans would shift itself into overdrive. When you were cruising along in OD you could stomp the pedal and it would shift back to 3rd so you had a passing gear of sorts.

He would have to replace them every couple of years because they would tear up. He really was not hard on them either.

Edit about the air injector:

That is the emissions smog pump is it not?

ThatOneBlue67 · 04-06-2007, 06:07 PM

Now are these automatic overdrives or the 3 speeds with an overdrive solenoid?

**WorkinLonghorn** · 04-06-2007, 06:16 PM

Quote:

The air injection thing was very common in the late 70's up to the mid 90s or so

. I'm sure you meant to type "late 60's up to...". My last '69 had the air pump and injectors because it was a 1/2 ton. Current 3/4 didn't have to have them. Talking California here.
>>>

Quote:

That is the emissions smog pump is it not?

Right.

**special-K** · 04-06-2007, 06:24 PM

The o/d trans was a manual 3spd w/manual solenoid.This was about the last application on a`67.
That sounds like the CST horn cap and if the plastic is good it`s a hot little part.Heck,if you can get the glovebox door for cheap,I think JoesJunk would like to have that.

sb69chevy · 04-06-2007, 07:03 PM

Plastic was crystal clear and chrome was not very pitted at all. Both cap and glove door were sitting in the cab floor. Don't know that all of the goodies underneath the cap were there, though.

**WorkinLonghorn** · 04-06-2007, 08:16 PM

Quote:

The o/d trans was a manual 3spd w/manual solenoid.

Wow,this is a new one on me. It seems like a good idea but it sounds like it was from the parts bin of a car line and not designed for truck duty. I'd like to find out more about this option.

**special-K** · 04-06-2007, 08:21 PM

They were mostly in cars.
Just the horncap is all you need.The rest is the same and most would have that.Those parts are also available in repro.I wouldn`t say it`s ultra-valueable,but they should sell it cheap,Id think,and someone would want it here.I`m sure.

**too much stuff** · 04-06-2007, 08:23 PM

Overdrive trans from a 67 CST...

Longhorn Man · 04-06-2007, 08:48 PM

67 horn caps;

Longhorn Man · 04-06-2007, 08:49 PM

I thought one of those was beside the normal booring horn cap... the normal one is like silver with black writing on it... looks very lame beside either of these two.

sb69chevy · 04-06-2007, 08:52 PM

Longhorn, yep the one on top was the one I saw.

04-06-2007, 03:49 PM	#1
sb69chevy Registered User Join Date: Oct 2006 Location: Springfield, MO Posts: 375	Overdrive Trans Found a 67 truck in the yard today that had an overdrive transmission listed on its SPID. Tranny was gone, but there was a cable below the dash w/ "overdrive" placard around it. Never seen this before, just thought I would share. May not be any big deal. This truck also had an option that read something like "GM Air Inj Reactor"...What is this? I'll go back and get pics next week, if wanted. __________________ 1969 C/10 swb, 350, powerglide (daily driver) 2005 CRV (wife's ride)

04-06-2007, 03:55 PM	#2
gmc1969custom Registered User Join Date: Jan 2007 Location: Canton, TX Posts: 211	Re: Overdrive Trans Sounds interesting. __________________ 1969 Custom w/Turquoise Interior. 75k miles, 350 V8, THM400 (Almost) All Original

04-06-2007, 04:25 PM	#3
JHART 1972 Shorty Owner Join Date: Feb 2007 Location: Stationed in Cali , born and raised in PHX Arizona. Posts: 796	Re: Overdrive Trans i'd like to see some pics .... sound wierd to me would like to see more. __________________ 1972 Chevy Shorty C-10- Project In Work http://67-72chevytrucks.com/gallery/...ATT1721941.jpg- New Project

04-06-2007, 04:36 PM	#4
sb69chevy Registered User Join Date: Oct 2006 Location: Springfield, MO Posts: 375	Re: Overdrive Trans Yeah, it through me for a loop, too. I was in a hurry to get to work or I would've gone back to get the camera. I'm glad the glove box was still in the cab floor. Is there a "rare" or hard to find steering wheel cap for these (67-68)? __________________ 1969 C/10 swb, 350, powerglide (daily driver) 2005 CRV (wife's ride)

04-06-2007, 04:38 PM	#5
JHART 1972 Shorty Owner Join Date: Feb 2007 Location: Stationed in Cali , born and raised in PHX Arizona. Posts: 796	Re: Overdrive Trans I dont know about "rare" but i do know lmctruck.com has some. I never heard of a 67 with overdrive trans.... would be really cool find if it was though. __________________ 1972 Chevy Shorty C-10- Project In Work http://67-72chevytrucks.com/gallery/...ATT1721941.jpg- New Project

04-06-2007, 04:39 PM	#7
sb69chevy Registered User Join Date: Oct 2006 Location: Springfield, MO Posts: 375	Re: Overdrive Trans I don't need one, just saw one in the floor of the same truck. Looked very nice. Were there 2 different styles maybe? __________________ 1969 C/10 swb, 350, powerglide (daily driver) 2005 CRV (wife's ride)

04-06-2007, 04:39 PM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Overdrive Trans the overdrive was a very weak tranny offered on the smaller engines. If I recall, it wasn't even strong enough to hold up to the little 327. They worked fine, and there's stillsome on the road today. They also came in cars of the late 60's too. The air injection thing was very common in the late 70's up to the mid 90s or so... a smog pump would shoot air in the exhaust to help with emissions. that horn button is a valuable piece if in good shape. A 67 only item, it was part of the CST package. Last edited by Longhorn Man; 04-06-2007 at 04:41 PM.

04-06-2007, 04:43 PM	#9
sb69chevy Registered User Join Date: Oct 2006 Location: Springfield, MO Posts: 375	Re: Overdrive Trans Okay, so not that big of a deal on the OD thing...The horn cap did have glass or hard plastic in the center of if it. Looked pretty good. __________________ 1969 C/10 swb, 350, powerglide (daily driver) 2005 CRV (wife's ride)

04-06-2007, 05:32 PM	#10
ThatOneBlue67 I survived Dead Man's Curve. Join Date: Apr 2006 Location: The Nine-Five-687 Posts: 389	Re: Overdrive Trans Could someone find a pic of that cap? I'd love to see what it looks like! __________________ "The people should not be afraid of their government. The government should be afraid of it's people." "The Hurricane" 1967 Chevrolet C10 350 Eight Cylinder, 700R4 BowtieOverdrive *Cherry Bomb...* Disturbing the Peace Since 1968.

04-06-2007, 06:04 PM	#11
Bus Ted Knuckle Son of a gun Join Date: Jan 2007 Location: Hot Springs, Arkansas Posts: 1,636	Re: Overdrive Trans The overdrives were pretty common in the late 50's and 60's especially in cars, but also found in trucks till they found out they coudn't stand up to normal truck use. My Dad used to drive a 72 SWB w/ a 250 and a manual three speed column shift. He put an overdrive trans in it to lower the RPM's on the freeway. You could pull the cable under the dash to lock the trans from going into overdrive (like for towing). You shift through the three gears as usual, and when you were cruising along in third, you let up on the gas pedal and the trans would shift itself into overdrive. When you were cruising along in OD you could stomp the pedal and it would shift back to 3rd so you had a passing gear of sorts. He would have to replace them every couple of years because they would tear up. He really was not hard on them either. Edit about the air injector: That is the emissions smog pump is it not? __________________ Bill BEATERS ARE NEATER Last edited by Bus Ted Knuckle; 04-06-2007 at 06:10 PM.

04-06-2007, 06:07 PM	#12
ThatOneBlue67 I survived Dead Man's Curve. Join Date: Apr 2006 Location: The Nine-Five-687 Posts: 389	Re: Overdrive Trans Now are these automatic overdrives or the 3 speeds with an overdrive solenoid? __________________ "The people should not be afraid of their government. The government should be afraid of it's people." "The Hurricane" 1967 Chevrolet C10 350 Eight Cylinder, 700R4 BowtieOverdrive *Cherry Bomb...* Disturbing the Peace Since 1968.

04-06-2007, 06:24 PM	#14
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Overdrive Trans The o/d trans was a manual 3spd w/manual solenoid.This was about the last application on a`67. That sounds like the CST horn cap and if the plastic is good it`s a hot little part.Heck,if you can get the glovebox door for cheap,I think JoesJunk would like to have that. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

04-06-2007, 07:03 PM	#15
sb69chevy Registered User Join Date: Oct 2006 Location: Springfield, MO Posts: 375	Re: Overdrive Trans Plastic was crystal clear and chrome was not very pitted at all. Both cap and glove door were sitting in the cab floor. Don't know that all of the goodies underneath the cap were there, though. __________________ 1969 C/10 swb, 350, powerglide (daily driver) 2005 CRV (wife's ride)

04-06-2007, 08:21 PM	#17
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Overdrive Trans They were mostly in cars. Just the horncap is all you need.The rest is the same and most would have that.Those parts are also available in repro.I wouldn`t say it`s ultra-valueable,but they should sell it cheap,Id think,and someone would want it here.I`m sure. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

04-06-2007, 08:23 PM	#18
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,791	Re: Overdrive Trans Overdrive trans from a 67 CST... Attached Images __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto



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04-06-2007, 08:48 PM	#19
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Overdrive Trans 67 horn caps; Attached Images

04-06-2007, 08:49 PM	#20
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Overdrive Trans I thought one of those was beside the normal booring horn cap... the normal one is like silver with black writing on it... looks very lame beside either of these two.

04-06-2007, 08:52 PM	#21
sb69chevy Registered User Join Date: Oct 2006 Location: Springfield, MO Posts: 375	Re: Overdrive Trans Longhorn, yep the one on top was the one I saw. __________________ 1969 C/10 swb, 350, powerglide (daily driver) 2005 CRV (wife's ride)

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